Physics power question?
The maximum amount of water an adult in temperate climates can perspire in one hour is typically 1.80 L. However, after several weeks in a tropical climate the body can adapt, increasing the maximum perspiration rate to 3.50 L/hr. At what rate, in watts, is energy being removed when perspiring that rapidly? Assume all of the perspired water evaporates. At body temperature, the heat of vaporization of water is Lv = 24(10^5) J/kg.
Physics power to heat water question?
A household uses 100 gallons of hot water per day (1 gallon of water has a mass of 3.78 kg), and the water temperature must be raised from 10 degrees Celsius to 50 degrees Celsius. a) Find the average power needed to heat the water. Then assume you have solar collectors with 55% average efficiency at converting sunlight to thermal energy when tilted at your location's latitude.
Physics Heat question?
A solar cooker consists of a circular curved reflecting surface that concentrates sunlight onto the object to be warmed. The solar powered per unit area reaching the Earth's surface at this location is 600/W/m^2. the cooker faces the sun and has a diameter of 0.600m. Assume it is 40% efficient at transferring the suns energy to an open container holding 0.500L of water. If you ignore the heat capacity of the container and the water was initially at 20deg Celsius, how long does it take to boil all the water away? c water = 4186 J/kg deg C L vapourisation water = 2.26 x 10^6 J/kg How do u do this question and what equation do u use? i know the answer is 19.1x10^3s
Physics question, Power, energy and heat transfer?
While camping you boil water to make spaghetti. Your pot contains 2.5 kg of water initially at 10 degrees Celsius. You stoke up the campfire, and as a result the water gains energy at an increasing rate: P = a + bt, where a = 1.1 kW, b = 2.3 W/s, and t is the time in seconds. To the nearest minute, how long will it take to bring the water to a boil.
I need help with a physics problem (power vs heating up water and calories)?
Power is the cost that the paintings is completed. It's very similar to the connection among pace and role. The commonplace unit for vigour is the watt which will also be written as Joules/moment. The joule is the commonplace unit for paintings. Work is the volume of drive implemented to transport an item a distance. For illustration, in case you would follow a quantity to how problematic your homework is, that might be the drive. How a lot homework you have got is the space. If you multiply them in combination, you know the way a lot homework you simply did. If you divide that by means of how lengthy it took you to do your homework, you might understand how a lot homework vigour you have got.
Physics Questions (Work and Energy)?
jointly as in maximum circumstances it truly is actual that count and ability are actually not created or destroyed, interior the case of the vast Bang, this does not artwork. in case you ever learn cosmology, you will locate that assuming one believes ability and count to have consistently existed, there improve into no clarification for it to have all of sudden exploded interior the vast Bang. by ability of this reasoning, the universe ought to have remained in stasis as a nil-Dimensional element in area--it had no reason to do in any different case. PLEASE do not brush aside THIS AS UNSUBSTANTIATED THEOLOGICAL NONSENSE--I truly have truly DOCUMENTED NON-BIASED learn FROM authorised materials TO decrease back IT UP! Albert Einstein improve right into a self-proclaimed agnostic, yet whilst he tried to "opposite-engineer" the universe interior the seek for a cosmological consistent that could desire to describe the universe as being countless (even earlier the vast bang), he declared his pursuit to be a FAILURE. He reasoned that there improve into no existence earlier the vast bang because of fact not something existed to reason the vast bang to ensue. The universe all of us comprehend might purely exist for eternity as a element in area with countless warmth and density. the vast BANG improve into AN effect, meaning IT had to HAVE A reason. a individual who could desire to go away the vast bang unexplained could desire to purely to boot say it in no way occurred. whether you individually have faith this to be the artwork of God or not, something that transcends the two count, area, time, and ability ought to have offered the causal ingredient to start up up the vast bang (and by ability of extension) the formation of the universe. FOR destiny REFERENCE-- I strongly urge you to be extra gentle interior the wordings of you questions. For all persons who have faith in God, technological understanding is in basic terms the learn of his introduction--the place the introduction reflects the author. thank you, GINTABLE, for affirming that this question is gibberish, as this provides no ideal to brush aside faith to be pseudo-technological understanding. Seeing as no person can be sure this "doubtful reason" of the universe, except you could substantiate it, don't be so speedy to discredit those with faith. The Bible supplies me each and every of the evidence i desire, the place's yours?
Physics question - help?
Using the formula Pt = (4.2 * L * T ) / 3600 you can calculate the time it takes to heat a specific quantity of water from one temperature to another temperature. Once you have calculated the power used to heat the water, as represented by Pt in the above equation, divide this number by the heater element rating to find out how long it would take to heat your water. Related Searches: Heat EnergyHeat Calculator Difficulty:Moderately EasyInstructions 1 Calculate the kWh required to heat the water using the following formula: Pt = (4.2 * L * T ) / 3600. Pt is the power used to heat the water, in kWh. L is the number of liters of water that is being heated and T is the difference in temperature from what you started with, listed in degrees Celsius. 2 Sub in the appropriate numbers into the equation. So imagine you are heating 1 liters of water from 20 degrees to 100 degrees. Your formula would then look like this: Pt = (4.2 * 1 * (100-20)) / 3600, or Pt = 1.867/20 = .09385 3 Calculate the amount of time it takes to heat the water by dividing the power used to heat the water, which was determined to be 1.867 with the heater element rating, listed in kW. So if your heater element rating was 2.0 kW, your equation would look like this: heating time = .09385/ 2, or heating time =0..046925 hours. Therefore, it would take 0.046925 hours to heat 1 liters of water, with an element with a rating of 2 kW. http://www.ehow.com/how_8028611_calculat...
PHysics questions?
volume of water=200ml =200 cc mass of water m =200cc*1g/cc=200 g Specific heat of water S= 4.19 J/gC ______________________________________... PART1 Rise in temperature=80 -20 =60 C Heat required to raise temperature of 200 g of water from 20 C to 80 C=H1 =m*S*rise in temperature=200*4.19*60= 50280 J ______________________________________... PART2 Heat required to raise temperature of 100 g of water from 60Cto 90C=H2=m*S*riseinTemperature H2=100*4.19*30=12570 J H2/H1=12570 / 50280 ______________________________________... PART3 time t1 =heat /power =50280/50=1005.6 second time t2 =heat /power =12570/50=251.4 second ______________________________________...
According to physics, the power of an air conditioner is greater than a fan. Why?
The comparison that I’ve seen is between a heat pump and and electrical resistance heating. If you have a good source of heat, say a well with a big supply of 50 degree water, you can move that heat to your house with a heat pump (basically an air conditioner working backwards). A kilowatt of electricity may well be able to move energy from the water in the well to the air in your house at a rate of 4 or more kilowatts. The warmer the water, the more efficient the heat pump.The same comparison doesn’t work between a fan and an air conditioner. The fan is not taking heat energy out of the air (in fact it is making the air hotter). The fan cools by creating a breeze. The A/C on the other hand is taking heat out of the air. Apples and oranges.
Why can't we directly heat water and use the steam produced?
Mr. Kolker is correct. The water must be heated by some sort of fuel, be it by burning something (coal, wood, gas) or by nuclear reaction or solar energy that creates heat to turn the water into steam to power the turbines in the generators. A better question might be why we still use coal when there have been successful solar power plants developed as early as 1897 by Frank Shuman. Unfortunately, his revolutionary large-scale power plant was dismantled for the material used for the war effort (WWI circa 1911). Although he built other similar power plants up to 1916 for various smaller-scale applications. Why they were never employed for global power needs is a mystery to me, and any explanation seems insufficient when weighed against the benefits.For more information...Frank Shuman